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QR Challenge: Addition and Subtraction of Decimals

Created using the ClassTools QR Treasure Hunt Generator

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Teacher Notes

A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

3. Print out the QR codes.

4. Cut them out and place them around your class / school.

B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

Questions / Answers (teacher reference)

Question

Answer

1. Use hundredth grids to answer this question 1.22 + 0.34=1.56
2. Use hundredth grids to answer this question 2.73 - 0.94=1.79
3. Use a number line to answer this question 2.02 - 0.41=1.61
4. Use a number line to answer this question 1.38 - 0.73=0.65
5. If a DVD player costs $0.40 per month to run and the dishwasher costs $0.85, use a hundredths grid to work out the DIFFERENCE in the monthly running costs. $0.45
6. Use a number line to add the following: 0.37 + 0.47=0.84
7. Use a number line to add the following: 1.33 - 0.35=0.98
8. Use a hundredths grid to model the sum of 0.46 and 0.250.71
9. How could you use a hundredths grid to find pairs of decimals that have a difference of 0.26?Varied
10. Use a written method to answer the following: 8.24 + 19.1627.4
11. Use a written method to answer the following: 37.68 - 14.53=23.15
12. Use a written method to answer the following: 72.2 + ____ = 113.2436.04
13. Use a number line to answer the following: 9.12 + 82.4=91.52
14. Use a number line to answer the following: 91.5 - 66.13=25.37
15. One of the largest dinosaurs ever found, the Puertasaurus, measured 39.92 metres long. One of the smallest dinosaurs, the Compsognathus, measured 1.44 metres long. What was the difference in length of these two dinosaurs?38.49m
16. 70.1 - 65.81=4.29
17. 55.7 + 0.52=56.22
18. 89.82 - ___=43.5246.3
19. Show how many ways you can get the answer 3.45Varied

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_hundredth_grids_to_answer_this_question_1.22_+_0.34=

Question 1 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_hundredth_grids_to_answer_this_question__2.73_-_0.94=

Question 2 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_a_number_line_to_answer_this_question______2.02_-_0.41=

Question 3 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_a_number_line_to_answer_this_question______1.38_-_0.73=

Question 4 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=If_a_DVD_player_costs_$0.40_per_month_to_run_and_the_dishwasher_costs_$0.85,__use_a_hundredths_grid_to_work_out_the_DIFFERENCE_in_the_monthly_running_costs.

Question 5 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_a_number_line_to_add_the_following:_0.37_+_0.47=

Question 6 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_a_number_line_to_add_the_following:_1.33_-_0.35=

Question 7 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_a_hundredths_grid_to_model_the_sum_of_0.46_and_0.25

Question 8 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=How_could_you_use_a_hundredths_grid_to_find_pairs_of_decimals_that_have_a_difference_of_0.26?

Question 9 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_a_written_method_to_answer_the_following:_8.24_+_19.16

Question 10 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_a_written_method_to_answer_the_following:_37.68_-_14.53=

Question 11 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_a_written_method_to_answer_the_following:_72.2_+______=_113.24

Question 12 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_a_number_line_to_answer_the_following:_9.12_+_82.4=

Question 13 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Use_a_number_line_to_answer_the_following:_91.5_-_66.13=

Question 14 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=One_of_the_largest_dinosaurs_ever_found,_the_Puertasaurus,_measured_39.92_metres_long._One_of_the_smallest_dinosaurs,_the_Compsognathus,_measured_1.44_metres_long._What_was_the_difference_in_length_of_these_two_dinosaurs?

Question 15 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=70.1_-_65.81=

Question 16 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=55.7_+_0.52=

Question 17 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=89.82_-____=43.52

Question 18 (of 19)

 


Addition and Subtraction of Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Show_how_many_ways_you_can_get_the_answer_3.45

Question 19 (of 19)